"Valar Morghulis"
An army of White Walkers surrounds the Fist of the First Men.
"Valar Morghulis"
Daenerys commands her dragon babies to breathe fire and kill Pyat Pree.
"Valar Morghulis"
Theon's men knock him out in the middle of his rousing speech so they can avoid having to go to battle.
"Valar Morghulis"
Robb runs away with Talisa and marries her.
"Valar Morghulis"
Daenerys is reunited (via a hallucination) with her dead husband Khal Drogo while trapped in the House of the Undying.
"Valar Morghulis"
Jaqen H'ghar's completely changes his face in front of Arya.
"The North Remembers"/"The Old Gods and the New"
Cersei slaps Joffrey after he insinuates that he was a child of incest. Tyrion slaps Joffrey during the King's Landing riot.
"The Night Lands"
Theon makes sexual advances on a woman who turns out to be his sister.
"Fire and Blood"
Here be dragons! Daenerys emerges from the pyre ashes with three dragon hatchlings.
"Fire and Blood"
After losing her unborn son, Daenerys smothers her husband Drogo while he lies in a catonic state.
"Baelor"
Ned Stark is executed by beheading.
"The Pointy End"
Drogo rips out the tongue of an underling after he badmouths Daenerys.
"A Golden Crown"
Swellsword Bronn defeats Lysa's champion at Tyrion's trial by battle at the Eyre, earning Tyrion's freedom.
"A Golden Crown"
Viserys gets a (literal) crown of gold.
"The Wolf and the Lion"
The true nature of Renly Baratheon and Loras Tyrell's relationship is revealed.
"The Kingsroad"
Ned kills daughter Sansa's innocent direwolf, Lady, under orders from King Robert.
Watch! (Sob.)
"Winter Is Coming"
Bran is shoved out a window after discovering Queen Cersei having sex with her brother Jaime.